Production of arsenates from speiss



Peionteol Ange lg, ices.

* a it CLARENCE r. LIrrvILLE, or ELIZAIBEEH, new iissroisoe 'ro AMEBKFAK sMEL'lING earn neurone cosirnisr, or HEW some iiirer messy.

7 To all whom it may concem:.

' ,fBe it known that l, CLARENCE P.-LIN- vmLi-i, a citizen ofthe United States, and

resident of Elizabeth, in the. county of 6. Union and Stete of New Jersey, have invented certain new and useful Improvements in the Production 01" Arsenates from Speiss, of'which the following is a specifficetion, Y c 10 The invention relates in general to e procfor treating" nickel speiss forthe pur pose of extracting the arsenic and other wmetsls therefrom in a form suitable for marketable purposes. 15 Amonrth'e objects of the invention or to simplify the lmown methods of treating nickel speiss, to reduce the time end temperature necessary to efiect the roosting, to complete the process with one treatment end to eliminate certain objections which have characterized. the use or" ceustic'sode. in'prior processes. 7

Another object of "this invention is to provide a simple process by means of which practically all of the arsenic is removed directly from the spciss, economically and in a Way which Will permit of the separation of'the other metals Without eeleterious contermination. 30 Broadly I attain the invention by roasting the speiss with an excess of sodium sac bonate and dissolving out of the roast the resulting tri-soolium arsenete.

Various other objects anal advantages of the invention will be obvious from the following particular description of one method of precticicg the invention.

It is understood that the speiss herein referred to consists largely of arsenic and 40 iron with more or less of other metals such as lead, copper, nickel, cobalt, as Well as some of the precious metals.

OI1 D'l(3tllO(l for practicing the process hereinset forth is to mix nickel speiss prefersbly in a finely ground state with soilicient soda ash (sodium carbonate) to effect the clesirecl reaction and then to subject the mixture to a thorough roasting. Nothing is stifled to the mixture so that the rcaction is dependent entirely upon the to extract the arsenic. The SOL Application filer! April 13, 1921. serial 1%. 4.655;? E.

lievezl that the reaction can he expresses, as folloWs:- I

and in. one instance on amount soclu s equal to seventy-live percent by Wfllgi the speiss was added. The arsenic p in the sp-eiss combines with, the soc. ash erseneie" 'i-Lhe forming soluble tri-socliuni roost is then cli.;o' ed c pleces the trisoclimn arsenot-e in solution, leaving s r icluc carrying; iii the other elements .uc vvere present in the speiss inolutling the insoluble sodium ontimoneto,

The tri-soclium etc thus recovered is or" a high grade oi. aurity and can be marketed as so or by c known treat A with calcium hyclroxicie may used produce the 'tri-ccicium has e marketable veins The residue of arsenic free roasted can then he treeteol with hot conceoti'e sulphuric acid which dissolves out the iron, copper, nickel and cobalt as sulphates 2 leaves a, residue containing the lead, mony, gold, encl silver which may he by usual methocls to recover these i It is possible by 1': herein. suggestco to ob ing of the lower has been possible heretofore also acts as c diluting e roosting by making the choc e 9% ellowingchettersocessheir hath; in .1 processes cool preventing fusion or sincering of the speiss. The solubility of the cogper-nich'ei-coh group of metals from the arsenic free re is incresserl clue to the prior eliruine the arsenic thus ens oli" hotter less with su liurio ocztl and. z

tion over co viou y g of the amount of treetecc urthcr the so lotion is choc? thenecessit for handlin arsenic gases with their obvious danger to workmen and apparatus; and the use of expensive nitric acid heretofore regarded as necessary has been eliminated.

Having thus described my invention. I

presence or air supplied in sufficlent volume claim:

1. in the art of. treating nickel speiss, the process which consists in air roasting the speiss in the presence of sodium carbonate supplied in an amount in excess of the amount necessary to convert the arsenic present into an arsenate, and disssolving the roast with water to obtain a solution or trisodium arsenatc and to obtain the other metals in a residue substantially free of arsenic.

2. In the art of abstracting the arsenic directly from nickel speiss in one roasting opcratiom the process which consists in roasting the speiss solely with sodium carbonate and dissolving the resulting trisodiuin arsenate from the roast.

30 In the art of treating speiss, the process which consists in roasting the speiss withoutpre-roasting and without pre-oxidizing, in the presence of sodium carbonate to form a water soluble arsenate.

4. The process which consists in mixing sodium carbonate with speiss, subjecting the mixture to a single oxidizing roast in the to effect the necessary oxidizing reaction and dissolving the resulting tri-sodium arsenate from the roast.

5. The process which consists in mixing sodium carbonate with speiss in an amount sufficient to combine with all of the arsenic and antimony present, air roasting the mixture and dissolving the resulting tri-sodium iii-senate from the roast.

6. In the art of treating speiss, the method which consists in roasting the speiss in the presence of sodium carbonate as the sole reagent and with free access of air at a temperature sufliciently low to prevent fusion.

Signed this 5th day of April, A. D. 1921.

CLARENCE P. LINVILLE. 

